WO2011107036A2 - Data transmission method on switch device and apparatus thereof - Google Patents

Abstract

A data transmission method on a switch device and an apparatus thereof are provided in the embodiments of the present invention. The method includes: a first switch device receives a data stream needing to be forwarded, and the first switch device obtains the information of the destination network device which is going to receive the data stream; in the case that the state of the port from the first switch device to the destination network device is normal, the first switch device transmits, via the port from the first switch device to the destination network device, the data stream to the destination network device. With the present invention, the bandwidth needed by stack ports is greatly reduced, and the problem of insufficient bandwidth for the stack ports is solved. The number of the stack ports on the switch device is reduced, the number of the ports used for the data interaction with the network device on the switch device is increased, and thereby the utilization ratio of the ports on the switch device is improved.

Description

 Data transmission method and device on switching device

Technical field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method and apparatus on a switching device.

Background of the invention

The trunk (link aggregation) technology is an Ethernet link aggregation technology that implements load sharing and redundancy backup. Currently, trunk technology is widely used in Ethernet switching applications. As the number of ports continues to increase, various types of Ethernet switching devices begin to use multi-chip stacking to expand the number of ports, and cross-chip trunk technology appears on the basis of multi-chip stacking.

In the multi-chip stacking, the ports of different chips are bundled together, and the redundancy backup and load sharing function of the link are realized by the cross-chip trunk. Cross-chip trunks must support load sharing, stack port bandwidth between chips = port bandwidth x number of ports. If the bandwidth of a port is 1 Gb and the number of ports is 10, the stack port bandwidth is 10 Gb.

For example, in an in-frame (backplane) Ethernet switching application, multiple line cards are used to perform data interaction through two switching chips. In this case, the stack ports between the two switching chips require relatively large bandwidth. For example, in the Ethernet switching application scenario shown in FIG. 1, the line card 1, the line card 2, and the line card 3 exchange data through the switch chip A and the switch chip B. The bandwidths of the two links constituting the trunk in the line card 1, the line card 2, and the line card 3 are all 10G, and the data transmitted to the switch chip A by the line card 1, the line card 2, and the line card 3 may be exchanged at the same time. The stack port between the chip A and the switch chip B is transmitted to the switch chip B. Therefore, the bandwidth of the stack port between the switch chip A and the switch chip B needs at least 30 G to meet the data exchange needs. In FIG. 1, the stack port between the switch chip A and the switch chip B is 2×10=20G, which cannot meet the needs of data exchange.

A method for increasing the bandwidth of a stack port between switch chips is as follows: multiple stack ports are used together between two switch chips to improve stack port bandwidth and solve the problem of insufficient bandwidth of the stack port. .

In the process of implementing the present invention, the inventors have found that the above method for increasing the bandwidth of a stack port between switch chips in the prior art has at least the following problem: the method will occupy multiple ports of each switch chip for use as a trunk. The stacking of ports together reduces the number of ports on each switch chip for interacting with the line card, resulting in reduced utilization of ports on the switch chip.

For example, as shown in FIG. 2, the five ports on the switch chip A and the switch chip B are used as stack ports of the trunk together, and the stack port bandwidth reaches 50G. If there are a total of 10 ports on the switch chip A and the switch chip, only 5 ports remain on the switch chip A and the switch chip B for interacting with the line card, and the utilization of the ports on the switch chip A and the switch chip B Only 50%.

Summary of the invention

Embodiments of the present invention provide a data transmission method and apparatus on a switching device to improve utilization of a port on a switching device.

A data transmission method on a switching device, where a stacking port is set between a first switching device and a second switching device, the method specifically includes:

Receiving, by the first switching device, a data flow that needs to be forwarded, where the first switching device acquires a destination network device that receives the data flow;

The first switching device determines whether the state of the port of the first switching device to the destination network device is normal, and if yes, the first switching device passes the first switching device to the destination network device Transmitting the data stream to the destination network device; otherwise; the first switching device transmits the data stream to the second switching device by using a stack port between the second switching device and And causing the second switching device to transmit the data stream to the destination network device by using the second switching device to a port of the destination network device.

A data transmission device includes: a first switching device and a second switching device, where a stacking port is set between the first switching device and the second switching device,

The first switching device is configured to receive a data flow that needs to be forwarded, obtain a destination network device that receives the data flow, and determine whether a status of the port of the first switching device to the destination network device is normal, if If yes, the data flow is transmitted to the destination network device by using the first switching device to the port of the destination network device; otherwise, the stacking port is connected to the second switching device The data stream is transmitted to the second switching device;

The second switching device is configured to transmit, by using the second switching device to a port of the destination network device, a data stream transmitted by the first switching device to the destination network device.

According to the technical solution provided by the foregoing embodiments of the present invention, the switching device preferentially selects the port on the switching device for data forwarding, thereby greatly reducing the bandwidth required by the stacking port and solving the bandwidth of the stacking port. Insufficient problems. The number of stacking ports on the switching device can be reduced, the number of ports on the switching device for interacting with the network device is increased, and the utilization of the port on the switching device is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention, Those skilled in the art can also obtain other drawings based on these drawings without paying for creative labor.

1 is a schematic diagram of an Ethernet switching application scenario in the prior art;

2 is a schematic diagram of a stack port in which five ports on the switching device A and the switching device B are used as trunks together in the prior art;

FIG. 3 is a flowchart of processing a data transmission method on a switching device according to Embodiment 1 of the present invention;

FIG. 4 is a schematic diagram of an Ethernet switching application scenario according to Embodiment 1 of the present invention; FIG.

FIG. 5 is a schematic diagram of an implementation principle of a data transmission method on a switching device according to an application scenario shown in FIG.

FIG. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another data transmission apparatus according to an embodiment of the present invention.

Mode for carrying out the invention

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the following, in order to facilitate the understanding of the embodiments of the present invention, the embodiments of the present invention are not to be construed as limited.

Embodiment 1

Setting a stack port between the first switching device and the second switching device, where the plurality of network devices exchange data through the first switching device and the second switching, and each network device is respectively connected to the first switching device and the second switching device. Connected through the port.

The processing flow of the data transmission method on a switching device provided in this embodiment is as shown in FIG. 3, and includes the following processing steps:

Step 31: The first switching device receives the data stream that needs to be forwarded, and the first switching device acquires the destination network device that receives the data stream.

Step 32: When the status of the port of the first switching device to the destination network device is normal, the first switching device sends the data stream to the port of the destination network device by using the first switching device. Transmitted to the destination network device.

According to the technical solution provided by the foregoing embodiment, the embodiment of the present invention preferentially selects a port on the switching device to perform data forwarding, so that the bandwidth required by the stacking port can be greatly reduced, and the problem of insufficient bandwidth of the stacking port is solved. . The number of stacking ports on the switching device can be reduced, the number of ports on the switching device for interacting with the network device is increased, and the utilization of the port on the switching device is improved.

An Ethernet switching application scenario is provided in this embodiment. As shown in FIG. 4, the first switch board and the second switch board respectively provide 24 10G ports, and the two ports on the first switch board and the second switch board respectively. The two ports form a stacking port. There are two interconnected links between the first switchboard and the second switchboard. The stack port bandwidth is only 20Gb.

Each port of the line card N (0-10) is 10G, and there are two interconnection links between the first switch board and the second switch board and each line card N (0-10), and the line card N ( 0-10) The four interconnect links to the first switch board and the second switch board are trunked together.

Specifically, the first switching device in step 31 acquires the destination network device that receives the data stream, and may include:

The correspondence between the receiving address of each network device and the identifier of each network device is pre-stored on the first switching device and the second switching device. The network device may be a line card. When a plurality of link trunks between the network device such as each line card and each switching device are together, the network device may be pre-stored on the first switching device and the second switching device. Receiving address, identity, and corresponding trunk The correspondence between IDs.

The first switching device queries the pre-stored corresponding relationship according to the destination address of the received data stream, and determines, when the receiving address of the network device and the destination address of the data stream are the same according to the query result, determining the network device. The destination network device for the data stream.

For the application scenario shown in FIG. 4, the correspondence between the receiving address of the line card N (0-10) and the identifier is saved on the first switch board and the second switch board, and the first switch board receives the line card. After N (1-10) sends the data stream to the line card 0, it is confirmed by querying the correspondence that the receiving address of the line card 0 is the same as the destination address of the data stream, so that the line card 0 is determined as the data stream. Destination network device.

For the application scenario shown in FIG. 4, the schematic diagram of the implementation principle of the data transmission method on the switching device according to the embodiment of the present invention is shown in FIG. 5, and the specific processing procedure is as follows.

Specifically, the step 32 may include:

And maintaining, on the first switching device and the second switching device, an exchange table including an identifier of the port, a status, an identifier of the switching device where the port is located, and an identifier of the network device to which the port is connected, where the port includes: the first switching device And all ports on the second switching device.

The first switching device queries the switching table according to the identifier of the destination network device, and determines, according to the query result, that the network device that is located on the first switching device is in a normal state, and the connected network device is the destination network device. .

When the number of the ports is one, the first switching device transmits the data stream to the destination network device by using the port; when the number of the ports is multiple, the first switching device Selecting one of the plurality of ports according to a source address of the data stream, and transmitting the data stream to the destination network device by using the one port.

For the application scenario shown in FIG. 4, the exchange table saved on the first switch board and the second switch board may be as shown in Table 1 below.

Table 1:

Serial number	Switch board	Port identifier	status	Connected line card
1	First switch board	0	normal		Line card 0
2	First switch board	1	normal		Line card 0
3	First switch board	2	normal		Line card 1
4	First switch board	3	normal		Line card 1
twenty three	Second switch board	0	normal		Line card 0
twenty four	Second switch board	1	normal		Line card 0
25	Second switch board	2	normal		Line card 1
26	Second switch board	3	normal		Line card 1

The first switch board queries the switch table according to the identifier of the line card 0 (the destination network device), and determines that the two ports on the first switch board to the line card 0: the status of the port 0 and the port 1 are normal, so The first switch board selects one of port 0 or port 1 according to a preset routing rule, and transmits the data stream to the line card 0. The routing rule may be a source address of the data stream, a correspondence between port 0 and port 1, and the like.

The first switch board queries the switch table according to the identifier of the line card 0, and determines that the state of the port 1 to the line card 0 on the first switch board is normal, and the state of the port 0 is faulty, so the first switch board The data stream is transmitted to the line card 0 via port 1.

Specifically, the step 32 may further include:

When the state of the port of the first switching device to the destination network device is faulty, and the state of the port of the second switching device to the destination network device is normal, the first switching device passes and the second The stacking port between the switching devices transmits the data stream to the second switching device. The second switching device transmits the data stream to the destination network device by using the second switching device to a port of the destination network device.

Specifically, in the actual application, the exchange table maintained in the first switching device can only load the records of all the ports on the first switching device by default, and the second exchange can be loaded by default in the exchange table maintained in the second switching device. A record of all ports on the device.

For example, the exchange table maintained in the first switching device is as shown in Table 2 below.

Table 2:

Serial number	Switch board	Port identifier	status	Connected line card
1	First switch board	0	malfunction		Line card 0
2	First switch board	1	malfunction		Line card 0
3	First switch board	2	normal		Line card 1
4	First switch board	3	normal		Line card 1

The exchange table maintained in the second switching device is as shown in Table 3 below.

table 3:

Serial number	Switch board	Port identifier	State	Connected line card
1	Second switch board	0	Normal		Line card 0
2	Second switch board	1	Normal		Line card 0
3	Second switch board	2	Normal		Line card 1
4	Second switch board	3	Normal		Line card 1

When the first switching device queries the table 2 according to the identifier of the destination network device, when it is determined that the network device is not located on the first switching device, the state is normal, and the connected network device is the destination network device. Port. Loading the records of all the ports on the second switching device in the foregoing Table 2, the first switching device continues to query the table 2 according to the identifier of the destination network device, and determines that there is the second in the second according to the query result. When the switching device is in the normal state and the connected network device is the port of the destination network device, the first switching device transmits the data stream to the second switch by using a stack port between the second switching device and the second switching device. device.

The second switching device queries the pre-stored corresponding relationship according to the destination address of the received data stream, and when determining that the receiving address of the network device and the destination address of the data stream are the same according to the query result, the network device A destination network device that is determined to be the data stream. The second switching device queries the table 3 according to the identifier of the destination network device, and determines, according to the query result, that the network device that is located on the second switching device is in a normal state, and the connected network device is the destination network device. .

When the number of ports on the second switching device is normal, and the connected network device is one of the destination network devices, the second switching device transmits the data stream through the port Give the destination network device.

When the number of ports on the second switching device is normal, and the connected network device is the destination network device, the second switching device selects according to the source address of the data stream. One of the plurality of ports, through which the data stream is transmitted to the destination network device.

For the application scenario shown in FIG. 4, the first switch board queries the table 2 according to the identifier of the line card 0, and determines the status of the two ports on the first switch board to the line card 0: port 0 and port 1. If the fault is the fault, the record of all the ports on the second switch board is loaded in the foregoing table 2. The first switch board continues to query the table 2 according to the identifier of the line card 0, and determines the second switch board according to the query result. The two ports on the line card 0: port 0, port 1 are all normal. Then, the first switchboard transmits the data stream to the second switchboard through the stack port.

The second switch board queries the table 3 according to the identifier of the line card 0, and determines two ports on the second switch board to the line card 0: the status of the port 0 and the port 1 are all normal. The second switching board presets a routing rule to select one of port 0 or port 1, and transmits the data stream to the line card 0. The routing rule may be a source address of the data stream, a correspondence between port 0 and port 1, and the like.

According to the technical solution provided by the foregoing embodiment, the embodiment of the present invention preferentially selects a port on the switching device to perform data forwarding, and the state of the port of the switching device to the destination network device is faulty. The stack port sends data streams to other network devices, and other network devices forward data streams. Therefore, the bandwidth required by the stack port can be greatly reduced, and the problem of insufficient bandwidth of the stack port can be solved.

The embodiment of the present invention can reduce the number of stack ports on the switching device, increase the number of ports on the switching device for interacting with the network device, and improve the utilization of ports on the switching device.

FIG. 6 is a schematic structural diagram of a data transmission apparatus according to an embodiment of the present invention, including: a first switching device 61 and a second switching device 62, where the first switching device 61 and the second switching device 62 Set the stack port between,

The first switching device 61 is configured to receive a data flow that needs to be forwarded, and obtain a destination network device that receives the data flow; and the first switching device determines a port of the first switching device to the destination network device. Whether the status is normal, if yes, transmitting the data stream to the destination network device through the port of the first switching device to the destination network device; otherwise, the first switching device passes and A stacking port between the second switching devices transmits the data stream to the second switching device.

The second switching device 62 is configured to: when the status of the port of the first switching device to the destination network device is faulty, the status of the port of the second switching device to the destination network device is normal. Receiving, by the first switching device, a data stream transmitted by the stacking port, and transmitting, by the second switching device, a port of the destination network device to the destination network device.

According to the technical solution provided by the foregoing embodiment, the embodiment of the present invention preferentially selects a port on the switching device to perform data forwarding, so that the bandwidth required by the stacking port can be greatly reduced, and the problem of insufficient bandwidth of the stacking port is solved. . The number of stacking ports on the switching device can be reduced, the number of ports on the switching device for interacting with the network device is increased, and the utilization of the port on the switching device is improved.

The structure of another data transmission apparatus provided by the embodiment of the present invention is as shown in FIG. 7 , and includes: a first switching device 71, configured to receive a data stream that needs to be forwarded, and acquire a destination network device that receives the data stream; Determining, by the first switching device, whether the state of the port of the first switching device to the destination network device is normal, and if yes, transmitting the data stream by using the first switching device to a port of the destination network device And the destination network device; otherwise, the first switching device transmits the data stream to the second switching device by using a stack port between the first switching device and the second switching device.

The second switching device 72 is configured to: when the state of the port of the first switching device to the destination network device is faulty, the state of the port of the second switching device to the destination network device is normal Receiving, by the first switching device, a data stream transmitted by the stacking port, and transmitting, by the second switching device, a port of the destination network device to the destination network device.

Specifically, the first switching device 71 includes:

The destination network device confirmation module 711 is configured to query, according to the destination address of the received data stream, the correspondence between the pre-stored receiving address of each network device and the identifier of each network device, and determine the receiving of the network device according to the query result. When the address and the destination address of the data stream are the same, the network device is determined as the destination network device of the data stream;

The exchange table maintenance module 712 is configured to maintain an exchange table including the identifiers of all the ports on the first switching device and the second switching device, the status, the identifier of the switching device where the port is located, and the identifier of the network device to which the port is connected;

The port query and confirmation module 713 is configured to query the exchange table maintained by the exchange table maintenance module 712 according to the identifier of the destination network device confirmed by the destination network device confirmation module 711, and determine that the first table is located according to the query result. On the switching device, the status is normal, and the connected network device is the port of the destination network device;

The data transmission module 714 is configured to: when the number of ports that are determined by the port query and confirmation module 713 to be located on the first switching device and the state is normal, and the connected network device is the destination network device, Transmitting the data stream to the destination network device by using the port; when the status is normal on the first switching device, the number of ports of the connected network device being the destination network device is multiple And selecting one of the plurality of ports according to a source address of the data stream, and transmitting the data stream to the destination network device.

Specifically, the second switching device 72 includes:

The destination network device confirmation module 721 is configured to query, according to the destination address of the received data stream, a correspondence between the pre-stored receiving address of each network device and the identifier of each network device, and determine the receiving of the network device according to the query result. When the address and the destination address of the data stream are the same, the network device is determined as the destination network device of the data stream;

The exchange table maintenance module 722 is configured to maintain an exchange table including the identifiers of all the ports on the first switching device and the second switching device, the status, the identifier of the switching device where the port is located, and the identifier of the network device to which the port is connected;

The port query and confirmation module 723 is configured to query the exchange table maintained by the exchange table maintenance module 722 according to the identifier of the destination network device confirmed by the destination network device confirmation module 721, and determine that the second table is located according to the query result. On the switching device, the status is normal, and the connected network device is the port of the destination network device;

The data transmission module 724 is configured to: when the number of ports that are confirmed by the port query and confirmation module 723 to be located on the first switching device, the state is normal, and the connected network device is the destination network device, Transmitting the data stream to the destination network device by using the port; when the status is normal on the first switching device, the number of ports of the connected network device being the destination network device is multiple And selecting one of the plurality of ports according to a source address of the data stream, and transmitting the data stream to the destination network device.

In summary, it can be seen from the technical solution provided by the foregoing embodiments of the present invention that the switching device preferentially selects a port on the switching device for data forwarding, and the port of the switching device to the destination network device is used. When the status is faulty, the data stream is sent to other network devices through the stack port, and the data stream is forwarded by other network devices. Therefore, the bandwidth required by the stack port can be greatly reduced, and the problem of insufficient bandwidth of the stack port can be solved.

The embodiment of the present invention can reduce the number of stack ports on the switching device, increase the number of ports on the switching device for interacting with the network device, and improve the utilization of ports on the switching device.

In the embodiment of the present invention, by adding the state information of the port in the exchange table maintained by the switching device, the switching device can preferentially select the port on the switching device for data forwarding, and can ensure the forwarding of the data stream is successful.

One of ordinary skill in the art can understand that all or part of the process of implementing the foregoing embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. When executed, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, or a read-only storage memory (Read-Only) Memory, ROM) or Random Access Memory (RAM).

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims (8)

1. A data transmission method on a switching device, wherein a stacking port is set between a first switching device and a second switching device, where the method specifically includes:

   Receiving, by the first switching device, a data flow that needs to be forwarded, where the first switching device acquires a destination network device that receives the data flow;

   The first switching device determines whether the state of the port of the first switching device to the destination network device is normal, and if yes, the first switching device passes the first switching device to the destination network device Transmitting the data stream to the destination network device; otherwise; the first switching device transmits the data stream to the second switching device by using a stack port between the second switching device and And causing the second switching device to transmit the data stream to the destination network device by using the second switching device to a port of the destination network device.
2. The data transmission method on the switching device according to claim 1, wherein the destination network device that the first switching device acquires the data stream comprises:

   The first switching device obtains the destination address of the data stream, and queries the pre-stored correspondence between the receiving address of each network device and the identifier of each network device according to the destination address, and determines the destination network device of the data stream. Logo.
3. The data transmission method on a switching device according to claim 2, wherein the first switching device transmits the data stream to the port by using the first switching device to a port of the destination network device Destination network equipment, including:

   Maintaining, on the first switching device and the second switching device, an exchange table including an identifier of each port, a status, an identifier of the switching device where the port is located, and an identifier of the network device to which the port is connected, where the port includes: All ports on the device and the second switching device;

   The first switching device queries the switching table according to the identifier of the destination network device, and determines, according to the query result, that the network device that is located on the first switching device is in a normal state, and the connected network device is the destination network device. And the first switching device transmits the data stream to the destination network device by using the port.
4. The data transmission method on the switching device according to claim 2 or 3, wherein the first switching device transmits the data stream through a stack port between the first switching device and the second switching device And the second switching device is configured to transmit, by the second switching device, the data stream to the destination network device by using the second switching device to a port of the destination network device, including:

   Maintaining, on the first switching device and the second switching device, an exchange table including an identifier of each port, a status, an identifier of the switching device where the port is located, and an identifier of the network device to which the port is connected, where the port includes: All ports on the device and the second switching device;

   The first switching device queries the switching table according to the identifier of the destination network device, and determines, according to the query result, that the network device that is not located on the first switching device is in a normal state, and the connected network device is the destination network device. However, there is a port on the second switching device, the state is normal, and the connected network device is the destination network device;

   Transmitting, by the first switching device, the data stream to the second switching device by using the stack port, where the second switching device is a normal, connected network device is a port of the destination network device Transmitting the data stream to the destination network device.
5. The data transmission method on a switching device according to claim 4, wherein said second switching device passes said data stream to said port of said destination network device by said network device having a normal state Transmitted to the destination network device, including:

   The second switching device acquires a destination address of the data stream, and queries a pre-stored correspondence between a received address of each network device and an identifier of each network device according to the destination address, and determines a destination network device of the data stream. Identification

   The second switching device maintains an exchange table including the identifiers of all the ports on the first switching device and the second switching device, the status, the identifier of the switching device where the port is located, and the identifier of the network device to which the port is connected, the second The switching device queries the switching table according to the identifier of the destination network device, and determines, according to the query result, that the network device that is located on the second switching device is in a normal state, and the connected network device is the destination network device;

   The second switching device transmits the data stream to the destination network device by using the network device whose status is normal and the connected network device is the destination network device.
6. A data transmission device, comprising: a first switching device and a second switching device, where a stacking port is set between the first switching device and the second switching device,

   The first switching device is configured to receive a data flow that needs to be forwarded, obtain a destination network device that receives the data flow, and determine whether a status of the port of the first switching device to the destination network device is normal, if If yes, the data flow is transmitted to the destination network device by using the first switching device to the port of the destination network device; otherwise, the stacking port is connected to the second switching device The data stream is transmitted to the second switching device;

   The second switching device is configured to transmit, by using the second switching device to a port of the destination network device, a data stream transmitted by the first switching device to the destination network device.
7. The data transmission device according to claim 6, wherein the first switching device specifically comprises:

   And a destination network device confirmation module, configured to acquire a destination address of the data stream, and query a correspondence between a received address of each network device and an identifier of each network device according to the destination address, and determine a destination of the data flow. Identification of the network device;

   a switch maintenance module, configured to maintain an identifier, a status, an identifier of a switching device where the port is located, and an exchange table of identifiers of network devices connected to the port, including the first switching device and the second switching device;

   a port querying and confirming module, configured to query an exchange table maintained by the switch table maintenance module according to the identifier of the destination network device confirmed by the destination network device confirmation module, and determine, according to the query result, that the switch device is located on the first switch device The status is normal, and the connected network device is the port of the destination network device.

   And a data transmission module, configured to transmit the data stream to the destination network device by using a port confirmed by the port query and confirmation module.
8. The data transmission device according to claim 6 or 7, wherein the second switching device specifically comprises:

   And a destination network device confirmation module, configured to acquire a destination address of the data stream, and query a correspondence between a received address of each network device and an identifier of each network device according to the destination address, and determine a destination of the data flow. Identification of the network device;

   a switch maintenance module, configured to maintain an identifier, a status, an identifier of a switching device where the port is located, and an exchange table of identifiers of network devices connected to the port, including the first switching device and the second switching device;

   a port querying and confirming module, configured to query an exchange table maintained by the exchange table maintenance module according to the identifier of the destination network device confirmed by the destination network device confirmation module, and determine that the second switching device is located according to the query result The status is normal, and the connected network device is the port of the destination network device.

   And a data transmission module, configured to transmit the data stream to the destination network device by using a port confirmed by the port query and confirmation module.

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